Develop Reference

Copying GZipStream to file

I want to decompress a file that was uploaded encoded with gzip to S3 straight to a file stream.
Here is my method that returns the gzip stream after decompressing the S3 stream:
using var stream = await _s3.GetObjectStreamAsync(_processServiceOptions.BucketName, key, null);
using var gzipStream = new GZipStream(stream, CompressionMode.Decompress, true);
await WriteToFileAsync(gzipStream);
I'm trying to use it like so to copy it directly to the file stream, instead of loading it into memory using another stream...
async Task WriteToFileAsync(Stream data)
{
using (var fs = File.OpenWrite(path))
{
await data.CopyToAsync(fs);
}
}
However I'm getting System.IO.InvalidDataException: The archive entry was compressed using an unsupported compression method.
Why is that?

Load Image from Stream

Is there any way of converting Stream to Image?
I tried Bitmap, but it states that I don't have System.Drawing... so I tried this:
var bitMap = new BitmapImage();
bitMap.SetSourceAsync(stream);
image.Source = bitMap;
EDIT:
I am trying to build UWP app + using VS 2015.
2 - It just states that System.Drawing does not exist in the namespace.
EDIT2:
Ok, I might have explained it wrong. The idea is: I have an Image, and I want to change its source to something different and then for it to reload, so I can see the image.
The image is effectively a "Stream", so I assume I need to convert it to Bitmap and then load somehow.
EDIT3:
Ok, so I think it will be easier to describe and then use the code above:
There is a picture box and I am using:
var stream = new InMemoryRandomAccessStream();
await mediaCapture.CapturePhotoToStreamAsync(ImageEncodingProperties.CreateJpeg(), stream);
Now I would like this Captured Photo to be displayed as an Image. ( Image "box" is created at the start, so the idea is to change source).

Right, so I managed to fix it:
var bitMap = new BitmapImage();
stream.seek(0); // LINE ADDED
bitMap.SetSourceAsync(stream);
image.Source = bitMap;
I turned out that the error that was being produced was : "The component cannot be found.", so I managed to fix it by using this trick.

I am not sure if this is what you are looking for but if you would like to use stream with BitMapImage you should use:
var image = new BitmapImage();
await image.SetSourceAsync(stream);
For instance when you have your photo stored as a byte[] array you can use the stream to convert it to image:
using (InMemoryRandomAccessStream stream = new InMemoryRandomAccessStream())
{
DataWriter writer = new DataWriter(stream.GetOutputStreamAt(0))
writer.WriteBytes(<<here your byte[] array>>);
await writer.StoreAsync();
var image = new BitmapImage();
await image.SetSourceAsync(stream);
}
Is that what you need?

How to upload a large file (1 GB +) to Google Drive using GoogleDrive REST API

I am tying to upload large files(1 GB+) to Google Drive using GoogleDrive API. My code works fine with smaller files. But when it comes to larger files error occurs.
Error occurs in the code part where the the file is converted into byte[].
byte[] data = System.IO.File.ReadAllBytes(filepath);
Out of memory exception is thrown here.

Probably you followed developers.google suggestions and you are doing this
byte[] byteArray = System.IO.File.ReadAllBytes(filename);
MemoryStream stream = new MemoryStream(byteArray);
try {
FilesResource.InsertMediaUpload request = service.Files.Insert(body, stream, mimeType);
request.Upload();
I have no idea why the suggest to put the whole file in a byte array and then create a MemoryStream on it.
I think that a better way is this:
using(var stream = new System.IO.FileStream(filename,
System.IO.FileMode.Open,
System.IO.FileAccess.Read))
{
try
{
FilesResource.InsertMediaUpload request = service.Files.Insert(body, stream, mimeType);
request.Upload();
.
.
.
}

SoundCloud Stream_url doesnt work on Raspberry Pi

I have been discussing this topic on another forum and no one could actually help, let's see if someone here can.
I Have a Problem with the URI you get from the Soundcloud Api to play a song. On my dekstop this Command:
mediaelement.Source = new Uri("https://api.soundcloud.com/tracks/218090824/stream?client_id=YOUR_CLIENT_ID");
mediaelement.Play();
works just fine, on the PI it doesn't at all, no clue why.
I have a workaround for now which looks like this:
Uri turi = new Uri("https://api.soundcloud.com/tracks/218090824/stream?client_id=YOUR_CLIENT_ID");
IRandomAccessStreamReference rsr = RandomAccessStreamReference.CreateFromUri(turi);
PBar.Visibility = Windows.UI.Xaml.Visibility.Visible;
StorageFile file1 = await StorageFile.CreateStreamedFileFromUriAsync("test mp3", turi, rsr);
IRandomAccessStream stream = await file1.OpenReadAsync();
PBar.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
mediaElement.PosterSource = img;
mediaElement.SetSource(stream, "audio/mp3");
mediaElement.Play();
The Problem here is that the files are being downloaded before they are played, this is not a problem if the songfile is <10 mb but with mixtapes >100 mb this takes a long time. So Is it somehow possible to get an IRandomAccessStream from the URI which can be played while being downloaded?
This Solution:
HttpClient httpClient = new HttpClient();
HttpResponseMessage response = await httpClient.GetAsync("https://api.soundcloud.com/tracks/218090824/stream?client_id=YOUR_CLIENT_ID", HttpCompletionOption.ResponseHeadersRead);
HttpResponseMessage rs = await httpClient.GetAsync(response.RequestMessage.RequestUri, HttpCompletionOption.ResponseHeadersRead);
Stream stream = await rs.Content.ReadAsStreamAsync();
IRandomAccessStream content = stream.AsRandomAccessStream();
mediaElement.SetSource(content, "audio/mpeg");
doesn't work because I get an error when i want to convert the Stream to IRandomAccessStream which says: ""Cannot use the specified Stream as a Windows Runtime IRandomAccessStream because this Stream does not support seeking."

Issue has been resolved with the latest Windows IOT Update.

Create a stream from a bitmap on Windows Runtime

I would like to create a stream from a bitmap. First I did it with :
Stream imgStream = typeof(Main).GetTypeInfo().Assembly.GetManifestResourceStream("ApplicationBlockBase.Assets.testimage.jpg");
But now I need to create a Stream from a local image. Do you have any ideas?
Thanks for your time, regards.

Let me know it this works or not.
StorageFile imageFile = await (await Windows.ApplicationModel.Package.Current.InstalledLocation.GetFolderAsync("Assets")).GetFileAsync("testimage.jpg");
Stream imgStream = await imageFile.OpenStreamForReadAsync();